treadmill

mastery
/ˈtɹɛd.mɪl/nounverb

card 1 of 10 · context meaning

Which meaning of 'treadmill' best matches the usage in the sentence?

For years he's been treadmilling it, day in and day out, and presently the graying hair at the temples will shock him into the grim reality that he is getting old—and getting little else.